diff options
author | Matias Zabaljauregui <matias.zabaljauregui@cern.ch> | 2007-10-22 05:03:33 +0400 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 09:49:53 +0400 |
commit | df29f43e650df29456804dabdb2611de914e7c0f (patch) | |
tree | 2f8de4a2f1b7c4141e710123fc86db266f507d83 /drivers/lguest/lg.h | |
parent | 47aee45ae3c708ab678e09abfba0efaf6ca0e87a (diff) | |
download | linux-df29f43e650df29456804dabdb2611de914e7c0f.tar.xz |
Pagetables to use normal kernel types
This is my first step in the migration of page_tables.c to the kernel
types and functions/macros (2.6.23-rc3). Seems to be working OK.
Signed-off-by: Matias Zabaljauregui <matias.zabaljauregui@cern.ch>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/lg.h')
-rw-r--r-- | drivers/lguest/lg.h | 45 |
1 files changed, 8 insertions, 37 deletions
diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index c2557cfd86c7..dc15b88208ff 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -28,45 +28,10 @@ struct lguest_dma_info u8 interrupt; /* 0 when not registered */ }; -/*H:310 The page-table code owes a great debt of gratitude to Andi Kleen. He - * reviewed the original code which used "u32" for all page table entries, and - * insisted that it would be far clearer with explicit typing. I thought it - * was overkill, but he was right: it is much clearer than it was before. - * - * We have separate types for the Guest's ptes & pgds and the shadow ptes & - * pgds. There's already a Linux type for these (pte_t and pgd_t) but they - * change depending on kernel config options (PAE). */ - -/* Each entry is identical: lower 12 bits of flags and upper 20 bits for the - * "page frame number" (0 == first physical page, etc). They are different - * types so the compiler will warn us if we mix them improperly. */ -typedef union { - struct { unsigned flags:12, pfn:20; }; - struct { unsigned long val; } raw; -} spgd_t; -typedef union { - struct { unsigned flags:12, pfn:20; }; - struct { unsigned long val; } raw; -} spte_t; -typedef union { - struct { unsigned flags:12, pfn:20; }; - struct { unsigned long val; } raw; -} gpgd_t; -typedef union { - struct { unsigned flags:12, pfn:20; }; - struct { unsigned long val; } raw; -} gpte_t; - -/* We have two convenient macros to convert a "raw" value as handed to us by - * the Guest into the correct Guest PGD or PTE type. */ -#define mkgpte(_val) ((gpte_t){.raw.val = _val}) -#define mkgpgd(_val) ((gpgd_t){.raw.val = _val}) -/*:*/ - struct pgdir { unsigned long cr3; - spgd_t *pgdir; + pgd_t *pgdir; }; /* We have two pages shared with guests, per cpu. */ @@ -157,6 +122,12 @@ int lguest_address_ok(const struct lguest *lg, unsigned long addr, unsigned long len); int run_guest(struct lguest *lg, unsigned long __user *user); +/* Helper macros to obtain the first 12 or the last 20 bits, this is only the + * first step in the migration to the kernel types. pte_pfn is already defined + * in the kernel. */ +#define pgd_flags(x) (pgd_val(x) & ~PAGE_MASK) +#define pte_flags(x) (pte_val(x) & ~PAGE_MASK) +#define pgd_pfn(x) (pgd_val(x) >> PAGE_SHIFT) /* interrupts_and_traps.c: */ void maybe_do_interrupt(struct lguest *lg); @@ -187,7 +158,7 @@ void guest_set_pmd(struct lguest *lg, unsigned long cr3, u32 i); void guest_pagetable_clear_all(struct lguest *lg); void guest_pagetable_flush_user(struct lguest *lg); void guest_set_pte(struct lguest *lg, unsigned long cr3, - unsigned long vaddr, gpte_t val); + unsigned long vaddr, pte_t val); void map_switcher_in_guest(struct lguest *lg, struct lguest_pages *pages); int demand_page(struct lguest *info, unsigned long cr2, int errcode); void pin_page(struct lguest *lg, unsigned long vaddr); |